Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 49 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 42
Alarm No.: 30 Name: Regenerative error
Alarm content
Permissible regenerative power of the built-in regenerative resistor or regenerative option is exceeded.
A regenerative transistor in the servo amplifier is malfunctioning.
Detail
No.
Detail name Cause Check method Check result Action Target
30.3 Regeneration
feedback signal
error
(1) A detection circuit of
the servo amplifier is
malfunctioning.
Remove the
regenerative option or
built-in regenerative
resistor, and then
check if the alarm
occurs at power on.
For MR-J4-03A6(-RJ)
and MR-J4W2-0303B,
check if the alarm
occurs at power on. The alarm occurs. Replace the servo
amplifier. [A]
[B]
[WB]
[RJ010]
[GF]
The alarm does not
occur. Check (2).
(2) Something near the
device caused it.
Check the noise,
ground fault, ambient
temperature, etc. It has a failure. Take
countermeasures
against its cause.
Alarm No.: 31 Name: Overspeed
Alarm content
The servo motor seed has exceeded the permissible instantaneous speed.
The linear servo motor seed has exceeded the permissible instantaneous speed.
Detail
No.
Detail name Cause Check method Check result Action Target
31.1 Abnormal
motor speed
(1) The command pulse
frequency is high.
Check the command
pulse frequency. The command pulse
frequency is high. Check operation
pattern. [A]
The command pulse
frequency is low. Check (2).
(2) The settings of the
electronic gear are
incorrect.
Check the setting
value of the electronic
gear. The setting value is
incorrect. Review the settings.
The setting value is
correct. Check (5).
(3) The command from the
controller is excessive.
Check if the command
from the controller is
over the permissible
speed. It is over the
permissible speed. Check operation
pattern. [B]
[WB]
[RJ010]
[GF]
It is less than the
permissible speed. Check (4).
(4) A larger speed
command than the
overspeed alarm level
was inputted.
Check that the actual
servo motor speed is
higher than the setting
value of [Pr. PC08
Overspeed alarm
detection level]. The servo motor
speed is higher than
the overspeed alarm
detection level. Review the [Pr.
PC08] setting.
The servo motor
speed is lower than
the overspeed alarm
detection level. Check (5).
(5) The servo motor was at
the maximum torque
(maximum thrust) at the
time of acceleration.
Check if the torque
(thrust) at the time of
acceleration is the
maximum torque
(maximum thrust). It is the maximum
torque (maximum
thrust). Increase the
acceleration/
deceleration time
constant. Or reduce
the load. [A]
[B]
[WB]
[RJ010]
[GF]
It is less than the
maximum torque
(maximum thrust). Check (6).
(6) The servo system is
unstable and oscillating.
Check if the servo
motor is oscillating. It is oscillating. Adjust the servo
gain. Or reduce the
load.
It is not oscillating. Check (7).
(7) The velocity waveform
has overshot.
Check if it is
overshooting because
the acceleration time
constant is too short. It is overshooting. Increase the
acceleration/
deceleration time
constant.
It is not
overshooting. Check (8).